My starting diopters were L: -2.5 sph with -1.25 cyl axis 150 and R: -4 sph (glasses prescription managed to add in some cyl in the right eye; thankfully I haven’t worn those all that much).
I got all excited when I started and ordered a pair of Zenni’s based solely on distance measurements which came out to L: -3.0 and R: -3.5, which seems sufficient correction for certain circumstances but not others.
Has anyone else noticed that astigmatism is pupil-dependent? One interesting thing I noticed was that in daylight when my pupil is contracted my left eye has better acuity than my right and the effects of the astigmatism diminish dramatically. Once the brightness decreases, the focus problems associated with astigmatism seem to become more pronounced and it becomes rather difficult to focus with my left eye due to the lovely induced astigmatism.
I concluded that dropping the entire -1.25 cyl was probably too aggressive for non-daylight conditions, but it’s clear that I don’t seem to need any cyl in daylight. It was also insufficient for reading and computer work, unfortunately.
After fiddling with the lens test kit I decided to retreat a bit and try a modest reduction to L: -2.5 sph -0.75 cyl axis 150, R: -3.75 sph which seems to achieve very similar acuity in both eyes. I ordered contacts and the acuity is probably 99% the same as the original with a little bit of astigmatism blur at night with point light sources. I figure I’ll give this one 90 day supply of contacts worth and reevaluate. Hilariously the optometrist wanted to bump me up to 4.25 in the right eye at the last exam because I didn’t quite get 20/20 at a -4. Alas…
What have people’s strategy been regarding cylinder reduction? I see a few routes:
- Abandon this and pay attention to the instructions to try reducing SPH only. CYL annoys me, in particular because they just snuck that in the past two years whereas prior I was SPH only.
- Continue on this path. Probably next try reducing SPH – concerned about reducing CYL by 0.75 in the next round. I could potentially try increasing SPH when I do the next CYL reduction? Or I may need to switch to glasses due to torric lens availability:
Another note is that torric contacts are not available in -0.5 cylinder or below, so there’s no way to lower that without going to regular contacts. Could do something ridiculously crazy like contacts normalized with SPH only and then contact-relative differentials with like +1.5 sph and -0.5 CYL in the L eye. I may also switch to glasses more full time at least while I adjust through CYL reduction.
Sorry for the ramble…